"Project ERROR" when opening project

Each time I open a project in Creator I see the following error message in the "General Messages" view:

Project ERROR: Cannot run compiler 'cl'. Maybe you forgot to setup the environment?
Error while parsing file C:\Users\rob\dev\src\creator-4.5-enterprise\qtcreator\tests\manual\debugger\simple\simple.pro. Giving up.

Building and running the project work fine, though, so the message seems to be pointless. It seems to be caused by QTBUG-62065. Is there anything Creator could do about it?

Edit: When retrying now, the project can be built, but crashes when running it. Closing and reopening the project fixes this. See comment below.